| 摘要 |
<p>PURPOSE:To make it possible to smoothly replace air stored in the vicinity of the first floor for water flowing into the first floor from the bathtub in a short time by providing an air extracting device at a junction between an additional burning suction horizontal extended pipe of the second floor and a suction vertical extended pipe of the second floor. CONSTITUTION:An air extraction valve 7 is provided at the junction between an additional suction horizontal extended pipe 2 of the second floor and a suction vertical extended pipe 3 from the second floor to the first floor. By the above describe construction, when water flows into a circulation bath heat source apparatus 4, water in the bathtub is required to flow into the pipeline while being replaced for air within the pipeline. However, since air is discharged by the suction vertical extended pipe 3 through which air is smoothly risen up by the air extraction valve 7, the operation of the heat source apparatus 4 of the direct circulation bath can be carried out smoothly, and convenience for use can be improved.</p> |
